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Revert "Bionic libs and the dynamic linker are bind mounted"

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This reverts commit 2599088ff6.
Reason: Breaks some 3p apps.

Bug: 122920047
Test: run the app, login.
Change-Id: Idea332b1f91e9d2ac6ebd3879da7820c8ba2284f
This commit is contained in:
Jiyong Park 2019-01-18 12:29:12 +09:00
parent 80aec3f0f0
commit 8b73dfc0a4
4 changed files with 5 additions and 199 deletions
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82
init/builtins.cpp
View file

@ -1098,86 +1098,6 @@ static Result<Success> do_parse_apex_configs(const BuiltinArguments& args) {
}
}
static Result<Success> bind_mount_file(const char* source, const char* mount_point,
bool remount_private) {
if (remount_private && mount(nullptr, mount_point, nullptr, MS_PRIVATE, nullptr) == -1) {
return ErrnoError() << "Could not change " << mount_point << " to a private mount point";
}
if (mount(source, mount_point, nullptr, MS_BIND, nullptr) == -1) {
return ErrnoError() << "Could not bind-mount " << source << " to " << mount_point;
}
return Success();
}
static Result<Success> bind_mount_bionic(const char* linker_source, const char* lib_dir_source,
const char* linker_mount_point, const char* lib_mount_dir,
bool remount_private) {
if (access(linker_source, F_OK) != 0) {
return Success();
}
if (auto result = bind_mount_file(linker_source, linker_mount_point, remount_private);
!result) {
return result;
}
for (auto libname : kBionicLibFileNames) {
std::string mount_point = lib_mount_dir + libname;
std::string source = lib_dir_source + libname;
if (auto result = bind_mount_file(source.c_str(), mount_point.c_str(), remount_private);
!result) {
return result;
}
}
return Success();
}
// The bootstrap bionic libs and the bootstrap linker are bind-mounted to
// the mount points for pre-apexd processes.
static Result<Success> do_prepare_bootstrap_bionic(const BuiltinArguments& args) {
static bool prepare_bootstrap_bionic_done = false;
if (prepare_bootstrap_bionic_done) {
return Error() << "prepare_bootstrap_bionic was already executed. Cannot be executed again";
}
if (auto result = bind_mount_bionic(kBootstrapLinkerPath, kBootstrapBionicLibsDir,
kLinkerMountPoint, kBionicLibsMountPointDir, false);
!result) {
return result;
}
if (auto result = bind_mount_bionic(kBootstrapLinkerPath64, kBootstrapBionicLibsDir64,
kLinkerMountPoint64, kBionicLibsMountPointDir64, false);
!result) {
return result;
}
LOG(INFO) << "prepare_bootstrap_bionic done";
prepare_bootstrap_bionic_done = true;
return Success();
}
// The bionic libs and the dynamic linker from the runtime APEX are bind-mounted
// to the mount points. As a result, the previous mounts done by
// prepare_bootstrap_bionic become hidden.
static Result<Success> do_setup_runtime_bionic(const BuiltinArguments& args) {
static bool setup_runtime_bionic_done = false;
if (setup_runtime_bionic_done) {
return Error() << "setup_runtime_bionic was already executed. Cannot be executed again";
}
if (auto result = bind_mount_bionic(kRuntimeLinkerPath, kRuntimeBionicLibsDir,
kLinkerMountPoint, kBionicLibsMountPointDir, true);
!result) {
return result;
}
if (auto result = bind_mount_bionic(kRuntimeLinkerPath64, kRuntimeBionicLibsDir64,
kLinkerMountPoint64, kBionicLibsMountPointDir64, true);
!result) {
return result;
}
ServiceList::GetInstance().MarkRuntimeAvailable();
LOG(INFO) << "setup_runtime_bionic done";
setup_runtime_bionic_done = true;
return Success();
}
// Builtin-function-map start
const BuiltinFunctionMap::Map& BuiltinFunctionMap::map() const {
constexpr std::size_t kMax = std::numeric_limits<std::size_t>::max();
@ -1216,7 +1136,6 @@ const BuiltinFunctionMap::Map& BuiltinFunctionMap::map() const {
{"mount_all", {1, kMax, {false, do_mount_all}}},
{"mount", {3, kMax, {false, do_mount}}},
{"parse_apex_configs", {0, 0, {false, do_parse_apex_configs}}},
{"prepare_bootstrap_bionic",{0, 0, {false, do_prepare_bootstrap_bionic}}},
{"umount", {1, 1, {false, do_umount}}},
{"readahead", {1, 2, {true, do_readahead}}},
{"restart", {1, 1, {false, do_restart}}},
@ -1225,7 +1144,6 @@ const BuiltinFunctionMap::Map& BuiltinFunctionMap::map() const {
{"rm", {1, 1, {true, do_rm}}},
{"rmdir", {1, 1, {true, do_rmdir}}},
{"setprop", {2, 2, {true, do_setprop}}},
{"setup_runtime_bionic", {0, 0, {false, do_setup_runtime_bionic}}},
{"setrlimit", {3, 3, {false, do_setrlimit}}},
{"start", {1, 1, {false, do_start}}},
{"stop", {1, 1, {false, do_stop}}},

76
init/service.cpp
View file

@ -140,43 +140,6 @@ Result<Success> Service::SetUpMountNamespace() const {
return Success();
}
Result<Success> Service::SetUpPreApexdMounts() const {
// If a pre-apexd service is 're' launched after the runtime APEX is
// available, unmount the linker and bionic libs which are currently
// bind mounted to the files in the runtime APEX. This will reveal
// the hidden mount points (targetting the bootstrap ones in the
// system partition) which were setup before the runtime APEX was
// started. Note that these unmounts are done in a separate mount namespace
// for the process. It does not affect other processes including the init.
if (pre_apexd_ && ServiceList::GetInstance().IsRuntimeAvailable()) {
if (access(kLinkerMountPoint, F_OK) == 0) {
if (umount(kLinkerMountPoint) == -1) {
return ErrnoError() << "Could not umount " << kLinkerMountPoint;
}
for (const auto& libname : kBionicLibFileNames) {
std::string mount_point = kBionicLibsMountPointDir + libname;
if (umount(mount_point.c_str()) == -1) {
return ErrnoError() << "Could not umount " << mount_point;
}
}
}
if (access(kLinkerMountPoint64, F_OK) == 0) {
if (umount(kLinkerMountPoint64) == -1) {
return ErrnoError() << "Could not umount " << kLinkerMountPoint64;
}
for (const auto& libname : kBionicLibFileNames) {
std::string mount_point = kBionicLibsMountPointDir64 + libname;
std::string source = kBootstrapBionicLibsDir64 + libname;
if (umount(mount_point.c_str()) == -1) {
return ErrnoError() << "Could not umount " << mount_point;
}
}
}
}
return Success();
}
Result<Success> Service::SetUpPidNamespace() const {
if (prctl(PR_SET_NAME, name_.c_str()) == -1) {
return ErrnoError() << "Could not set name";
@ -966,14 +929,6 @@ Result<Success> Service::Start() {
scon = *result;
}
if (!ServiceList::GetInstance().IsRuntimeAvailable() && !pre_apexd_) {
// If this service is started before the runtime APEX gets available,
// mark it as pre-apexd one. Note that this marking is permanent. So
// for example, if the service is re-launched (e.g., due to crash),
// it is still recognized as pre-apexd... for consistency.
pre_apexd_ = true;
}
LOG(INFO) << "starting service '" << name_ << "'...";
pid_t pid = -1;
@ -990,26 +945,6 @@ Result<Success> Service::Start() {
LOG(FATAL) << "Service '" << name_ << "' could not enter namespaces: " << result.error();
}
if (pre_apexd_) {
// pre-apexd process gets a private copy of the mount namespace.
// However, this does not mean that mount/unmount events are not
// shared across pre-apexd processes and post-apexd processes.
// *Most* of the events are still shared because the propagation
// type of / is set to 'shared'. (see `mount rootfs rootfs /shared
// rec` in init.rc)
//
// This unsharing is required to not propagate the mount events
// under /system/lib/{libc|libdl|libm}.so and /system/bin/linker(64)
// whose propagation type is set to private. With this,
// bind-mounting the bionic libs and the dynamic linker from the
// runtime APEX to the mount points does not affect pre-apexd
// processes which should use the bootstrap ones.
if (unshare(CLONE_NEWNS) != 0) {
LOG(FATAL) << "Creating a new mount namespace for service"
<< " '" << name_ << "' failed: " << strerror(errno);
}
}
if (namespace_flags_ & CLONE_NEWNS) {
if (auto result = SetUpMountNamespace(); !result) {
LOG(FATAL) << "Service '" << name_
@ -1017,13 +952,6 @@ Result<Success> Service::Start() {
}
}
if (pre_apexd_ && ServiceList::GetInstance().IsRuntimeAvailable()) {
if (auto result = SetUpPreApexdMounts(); !result) {
LOG(FATAL) << "Pre-apexd service '" << name_
<< "' could not setup the mount points: " << result.error();
}
}
if (namespace_flags_ & CLONE_NEWPID) {
// This will fork again to run an init process inside the PID
// namespace.
@ -1396,10 +1324,6 @@ void ServiceList::MarkServicesUpdate() {
delayed_service_names_.clear();
}
void ServiceList::MarkRuntimeAvailable() {
runtime_available_ = true;
}
void ServiceList::DelayService(const Service& service) {
if (services_update_finished_) {
LOG(ERROR) << "Cannot delay the start of service '" << service.name()

25
init/service.h
View file

@ -62,24 +62,6 @@
namespace android {
namespace init {
static constexpr const char* kLinkerMountPoint = "/system/bin/linker";
static constexpr const char* kBootstrapLinkerPath = "/system/bin/linker";
static constexpr const char* kRuntimeLinkerPath = "/apex/com.android.runtime/bin/linker";
static constexpr const char* kBionicLibsMountPointDir = "/system/lib/";
static constexpr const char* kBootstrapBionicLibsDir = "/system/lib/";
static constexpr const char* kRuntimeBionicLibsDir = "/apex/com.android.runtime/lib/bionic/";
static constexpr const char* kLinkerMountPoint64 = "/system/bin/linker64";
static constexpr const char* kBootstrapLinkerPath64 = "/system/bin/linker64";
static constexpr const char* kRuntimeLinkerPath64 = "/apex/com.android.runtime/bin/linker64";
static constexpr const char* kBionicLibsMountPointDir64 = "/system/lib64/";
static constexpr const char* kBootstrapBionicLibsDir64 = "/system/lib64/";
static constexpr const char* kRuntimeBionicLibsDir64 = "/apex/com.android.runtime/lib64/bionic/";
static const std::vector<std::string> kBionicLibFileNames = {"libc.so", "libm.so", "libdl.so"};
class Service {
public:
Service(const std::string& name, Subcontext* subcontext_for_restart_commands,
@ -142,7 +124,6 @@ class Service {
std::optional<std::chrono::seconds> timeout_period() const { return timeout_period_; }
const std::vector<std::string>& args() const { return args_; }
bool is_updatable() const { return updatable_; }
bool is_pre_apexd() const { return pre_apexd_; }
private:
using OptionParser = Result<Success> (Service::*)(std::vector<std::string>&& args);
@ -151,7 +132,6 @@ class Service {
Result<Success> SetUpMountNamespace() const;
Result<Success> SetUpPidNamespace() const;
Result<Success> EnterNamespaces() const;
Result<Success> SetUpPreApexdMounts() const;
void NotifyStateChange(const std::string& new_state) const;
void StopOrReset(int how);
void ZapStdio() const;
@ -262,8 +242,6 @@ class Service {
std::vector<std::string> args_;
std::vector<std::function<void(const siginfo_t& siginfo)>> reap_callbacks_;
bool pre_apexd_ = false;
};
class ServiceList {
@ -306,16 +284,13 @@ class ServiceList {
const std::vector<Service*> services_in_shutdown_order() const;
void MarkServicesUpdate();
void MarkRuntimeAvailable();
bool IsServicesUpdated() const { return services_update_finished_; }
bool IsRuntimeAvailable() const { return runtime_available_; }
void DelayService(const Service& service);
private:
std::vector<std::unique_ptr<Service>> services_;
bool services_update_finished_ = false;
bool runtime_available_ = false;
std::vector<std::string> delayed_service_names_;
};

21
rootdir/init.rc
View file

@ -12,12 +12,6 @@ import /init.usb.configfs.rc
import /init.${ro.zygote}.rc
on early-init
# Mount shared so changes propagate into child namespaces
# Do this before other processes are started from init. Otherwise,
# processes launched while the propagation type of / is 'private'
# won't get mount events from others.
mount rootfs rootfs / shared rec
# Set init and its forked children's oom_adj.
write /proc/1/oom_score_adj -1000
@ -46,8 +40,6 @@ on early-init
# cgroup for system_server and surfaceflinger
mkdir /dev/memcg/system 0550 system system
prepare_bootstrap_bionic
start ueventd
on init
@ -352,6 +344,8 @@ on post-fs
# Once everything is setup, no need to modify /.
# The bind+remount combination allows this to work in containers.
mount rootfs rootfs / remount bind ro nodev
# Mount shared so changes propagate into child namespaces
mount rootfs rootfs / shared rec
# Mount default storage into root namespace
mount none /mnt/runtime/default /storage bind rec
mount none none /storage slave rec
@ -587,14 +581,6 @@ on post-fs-data
# Check any timezone data in /data is newer than the copy in the runtime module, delete if not.
exec - system system -- /system/bin/tzdatacheck /apex/com.android.runtime/etc/tz /data/misc/zoneinfo
# Wait for apexd to finish activating APEXes before starting more processes.
# This certainly reduces the parallelism but is required to make as many processes
# as possible to use the bionic libs from the runtime APEX. This takes less than 50ms
# so the impact on the booting time is not significant.
wait_for_prop apexd.status ready
setup_runtime_bionic
parse_apex_configs
# If there is no post-fs-data action in the init.<device>.rc file, you
# must uncomment this line, otherwise encrypted filesystems
# won't work.
@ -816,3 +802,6 @@ on property:ro.debuggable=1
service flash_recovery /system/bin/install-recovery.sh
class main
oneshot
on property:apexd.status=ready
parse_apex_configs